Towards absolutely stable ergodicity breaking in two and three dimensions

Abstract

We propose new physically reasonable systems capable of avoiding ergodicity at infinite time in the thermodynamic limit, even with generic perturbations and when coupled to a heat bath. In two dimensions, the rainbow loop soup has (stretched) exponentially numerous absolutely stable nonergodic states with diverging energy but vanishing energy density. In three dimensions the rainbow membrane soup has (stretched) exponentially numerous nonergodic states with diverging energy barriers, leading to infinite-time robust ergodicity breaking that even survives coupling to a nonzero temperature heat bath. We describe our results in the language of exact emergent symmetries and demonstrate how the systems avoid common instabilities. Our construction naturally connects to quantum dimer models, topologically ordered systems, the group word construction, and Hamiltonians whose low-energy eigenstates exhibit anomalous entanglement entropy.

4.25+2 pages, 3 figures

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• Strong Hilbert space fragmentation and fractons from subsystem and higher-form symmetries
• Geometric fragmentation and anomalous thermalization in cubic dimer model
• Obstruction to Ergodicity from Locality and $U(1)$ Higher Symmetries on the Lattice